6ES7322-1BF01-0AA0 is a Simatic S7-300 digital input module from Siemens. This module can be used in a Siemens PLC system in order to acquire signals from digital devices such as push buttons, relays, and limit switches. It has 32 channels of digital input, with each channel accepting either a high (+24V) or low (0V) input level. It is rated for a maximum electrical on-off ratio of 1:20, and features an internal diagnostics circuit which can detect the input status of each channel, as well as overvoltage, overtemperature, and short circuit conditions. The module is equipped with removable terminal blocks for easy wiring, and supports both sinking and sourcing input signals.